WHILE there is a next sentence to read, DO:
BEGIN (* while *)
Read it, SLOWLY;
IF you do not understand it, THEN
BEGIN (* if *)
re-read the previous material, SLOWLY;
re-read the incomprehensible sentence, SLOWLY;
IF you still don't understand it, THEN
ask a fellow student to explain it;
IF you still don't understand it, THEN
ask your TA to explain it;
IF you still don't understand it, THEN
ask me;
IF you are in an upper-level course & you still don't understand it, THEN
write a paper about it (!)
END (* if *)
END; (* while *)
Since there is no next sentence (because the Boolean test in the
WHILE is false), you've understood the text!
For more general information, see my web page
"How to Study".